WIKA TC12-M - Handbuch (Seite 22)

GB
7. Information on mounting and operation in hazardous areas
14083458.01 09/2013 GB/D
WIKA operating instructions models TR12, TC12 (Ex i) 22
7. Information on mounting and operation in hazardous areas
(Europe)
WARNING!
In hazardous areas the use of a model TR10-A measuring insert without a
suitable connection head (housing) is not permissible!
Where required a suitable thermowell is to be used.
7.1 General information on explosion protection
The requirements of the 94/9/EC (ATEX) directive must be followed. Additionally
the specifications of the respective national regulations concerning Ex-usage
(e.g. EN/IEC 60079-10 and EN/IEC 60079-14) apply.
■ For the installation of the thermometers, only components (e.g. cables, cable glands,
etc.) permitted for “intrinsic safety” may be used.
■ For earthing the conductive screen, follow the specifications of EN/IEC 60079-14.
■ Certified and listed field cases (variant 3) should only be fitted and installed by a
specialist trained to the latest technology.
■ The direct threaded connection of the thermometer to the connection head or housing
must not be twisted or opened. Any alignment of the housing may only be made using
the optional, “nipple-union-nipple” neck tube.
■ The temperature resistance of the connecting cable must match the permissible
operating temperature of the housing.
For ambient temperatures above 60 °C, heat-resistant connecting cable must be used.
■ No capacitor may be fitted within the enclosure that has a residual energy of ≥0.02 mJ at
the end of the time required to open the housing.
■ Mounting within metallic enclosures:
The housing must be grounded against electromagnetic fields and electrostatic
discharge. It does not have to be connected separately to the equipotential bonding
system. It is sufficient if the metallic thermowell has a solid and secured contact with the
metallic vessel or its structural components or pipelines, so long as these components
are connected to the equipotential bonding system.
■ Mounting within non-metallic enclosures:
All electrically-conductive thermometer components within the hazardous area must be
provided with equipotential bonding.
■ Neither repairs nor structural modifications are permitted, and any would void the
guarantee and the respective certification.
■ The manufacturer shall not be responsible for constructional modifications after delivery
of the instruments.